Retention after orthodontic treatment is vital to maintaining a patients new smile. Clear retainers made from Essix ACE Plastic are an esthetically-pleasing option for patients who want to avoid wearing a retainer with a visible wire. Primary use: Aligners & Retainers. Average life: 18-24 month. Also used for temporary anterior bridges. Clear material has protective film on both sides that must be removed prior to fabrication. Store in a cool, dry place.